43aaf95cd1
1. Authentication provider plugin framework 2. An instance of authentication provider plugin for OIDC (OpenID Connect)
82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
#include "authn_plugin.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <dlfcn.h>
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#include <errno.h>
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#define PLUGIN_NAME_TEMPLATE "libkubernetes_%s.so"
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#define PLUGIN_LIB_NAME_SIZE 64
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#define PLUGIN_FUNCTION_GET_TOKEN "get_token"
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#define PLUGIN_FUNCTION_IS_EXPIRED "is_expired"
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#define PLUGIN_FUNCTION_REFRESH "refresh"
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authn_plugin_t *create_authn_plugin(const char *name)
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{
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static char fname[] = "create_authn_plugin()";
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authn_plugin_t *plugin = calloc(1, sizeof(authn_plugin_t));
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if (!plugin) {
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fprintf(stderr, "%s: Cannot allocate memory for plugin library %s.[%s]\n", fname, name, strerror(errno));
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return NULL;
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}
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char plugin_lib_name[PLUGIN_LIB_NAME_SIZE];
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memset(plugin_lib_name, 0, sizeof(plugin_lib_name));
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snprintf(plugin_lib_name, sizeof(plugin_lib_name), PLUGIN_NAME_TEMPLATE, name);
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void *dlhandler = dlopen(plugin_lib_name, RTLD_LAZY);
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if (!dlhandler) {
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fprintf(stderr, "%s: Cannot load the library %s.[%s]\n", fname, plugin_lib_name, dlerror());
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goto error;
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}
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plugin->name = strdup(name);
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plugin->dlhandler = dlhandler;
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plugin->get_token = dlsym(dlhandler, PLUGIN_FUNCTION_GET_TOKEN);
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if (!plugin->get_token) {
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fprintf(stderr, "%s: Cannot find the function %s in library %s.[%s]\n", fname, PLUGIN_FUNCTION_GET_TOKEN, plugin_lib_name, dlerror());
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goto error;
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}
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plugin->is_expired = dlsym(dlhandler, PLUGIN_FUNCTION_IS_EXPIRED);
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if (!plugin->is_expired) {
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fprintf(stderr, "%s: Cannot find the function %s in library %s.[%s]\n", fname, PLUGIN_FUNCTION_IS_EXPIRED, plugin_lib_name, dlerror());
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goto error;
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}
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plugin->refresh = dlsym(dlhandler, PLUGIN_FUNCTION_REFRESH);
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if (!plugin->refresh) {
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fprintf(stderr, "%s: Cannot find the function %s in library %s.[%s]\n", fname, PLUGIN_FUNCTION_REFRESH, plugin_lib_name, dlerror());
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goto error;
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}
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return plugin;
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error:
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free_authn_plugin(plugin);
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plugin = NULL;
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return plugin;
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}
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void free_authn_plugin(authn_plugin_t * plugin)
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{
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if (!plugin) {
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return;
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}
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if (plugin->dlhandler) {
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dlclose(plugin->dlhandler);
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plugin->dlhandler = NULL;
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}
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if (plugin->name) {
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free(plugin->name);
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plugin->name = NULL;
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}
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plugin->get_token = NULL;
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plugin->is_expired = NULL;
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plugin->refresh = NULL;
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free(plugin);
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}
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